Air-pump



W. E. ELLIS.

AIR PUMP.

APPLICATION FILED FEB. 17, 1920.

1,356,857, v Patented 0%, 26 1192a .UNITED STATES PATENT OFFICE.

WARREN E. ELLIS, or LEBO, KANsAs, AssrsNoa or ONE-HALF T0 WAYNE N.

TRAYLOR, OF LEBO, KANsAs.

. AIR-PUMP.

Application filed February 17, 1920.

To all whom it may concern:

Be it known that I, TVARREN E. ELLIS, a citizen of the United States,residing at Lebo, in the county of Coffey and State of Kansas, haveinvented certain new and useful Improvements in Air-Pumps, ofwhich thefollowing is a specification.

The present invention has to do with im provements in hand operated airpumps, the object in view being to provide a construction capable ofbeing cheaply manufactured while retaining the advantages and efficiencyof a doubleacting pump device. 5

With the above and other objects in view, the invention consists incertain novel combinations and arrangements of the parts as will morefully appear as the description proceeds, the novel features thereofbeing pointed out in the appended claims.

For a full understanding of the invention, reference is to be had to thefollowing description and accompanying drawings, in which Figure 1 is afront elevation of a pump constructed in accordance with the invention.

Fig. 2 is a side elevation thereof.

Fig. 3 is a vertical sectional view.

Corresponding and like parts are referred to in the followingdescription and inclicated in all the views of the drawings by the samereference characters.

Referring to the drawing, 1 designates the pump cylinder which isconstructed of a suitable diameter and length for the purposes of thedevice, said cylinder having at opposite sides longitudinally extendingslots 2. At the lower end the cylinder is threaded to receive theclosure cap 3 which is attached to the foot-piece or base 4, projectinglaterally and detachably connected to said cap by means of the fasteningmember 5. The cap and base 45 if desired may be of integralconstruction. The upper end of the cylinder is closed by means of thescrew plug 6 having the wrench hold extension 7 for screwing the plug inand out of the mouth of the cylinder. Mounted for reciprocation withinthe cylinder is a double headed piston or plunger 8, each head 8 ofwhich is provided with the usual washer 9 detachably secured thereto bythe fastening mem ber 10. The plunger is preferably reduced at itscentral portion to reduce friction and is formed with a transverseopening to re- Specification'of Letters Patent.

Patented Oct. 26, 1920. Serial No. 359,370]

ceive the cross pin 11 which projects through the slots 2 of thecylinder a suitable distance to receive the piston rods'12 attached tosaid pm by means of the nuts 13. These rods are arranged one ateach'side of the piston and are connected at their upper ends to thehandle 14:. The piston rods are supported and guided by means of theplate 14 which is detachably secured to the head 7 of the screw plug 6hereinbefore referred to by the. The plate is provided to whichthe-invention appertainsp 7 It will be apparent from the foregoing thatmanipulation of the handle 14 upwardly and downwardly will force the airalternately from the top and from the bottom of the cylinder through theair conduit 16 which is connected to the top and to the bottom of thecylinder respectively, a check valve 17 being arranged at both the topand bottom as customary. A flexible attaching tube 18 is connected tothis air tube 16 in the manner shown in the drawing, either at the topor the bottom, the latter preferably. The tube 16 it may be added isbent inwardly at an intermediate point indicated which might result ininjury to the air line.

This construction of pump eliminates the necessity for providing adouble cylinder construction and therefore necessarily representsasaving in expense of manufacture, and the elimination of packing glandsby such construction is obviously advantageous in that the life of thedevice is thereby prolonged. I

Having thus described the invention, what I claim as new and desire tosecure by Let ters Patent, is v 1'. An air pump comprlslng a cylinderbase for the pump and the other a guide for said piston rods.

2. A manually operated pump comprising open at both ends and havinglateral slots I midway thereof, a piston or'plunger slidably mounted insaid cylinder, opposite piston an open ended cylinder havinglongitudinally extending slots midway thereof, a double headed piston orplunger reciprocally mounted in said cylinder, a cross pin extendinthrough the plunger and the slots of the cylinder, a base platedetachably connected to the lower end of said cylinder and closing saidend, a guide member having apertures therein detachably connected to andclosing the opposite end of said cylinder, oppositely arranged pistonrods connected to said cross pin to manipulate the piston, said pistonrods passing through the apertures in the guide member, and a handleintermediate said piston rods.

Ii pump comprising a cylinder having oppositely arranged longitudinallyextending slots therethrough, a pistonor plunger mounted in saidcylinder, a closure cap detachably connected to the lower end of saidcylinder and closing said end, a base detachably connected to saidclosure cap, a detachable plug closing the upper end of said cylinder, aguide plate having an aperture at each end thereof, a detachablefastening ele ment securing said guide plate to the screw plug, pistonrods passing through the apertures of said guide plate and having ahandle connected thereto at one end, a cross pin extending through thepiston and the slots of the cylinder to which the piston rods areconnected for manipulating the piston, an air outlet at the upper end ofsaid cylinder and in the closure cap at the lower end thereof, and anair conduit connected to said air outlets. V

4. A hand operated air pump of the class described comprising a cylinderhaving oppositely arranged slots therethrough, a base detachablyconnected to the lower end of the cylinder and closing said end, a screwplug closing the opposite end of said cylinder, a guide plate having anaperture at each end thereof, a detachable fastening element securinsaid guide plate to the closure plug, piston rods passing through theapertures of said guide plate and having a handle connected thereto atone end, a cross pin extending through the piston and the slots of thecylinder to which the piston rods are connected for manipulating thepiston, an air conduit connected with the opposite ends of saidcylinder, and check valves mounted in said air conduit adjacent to therespective ends of the cylinder.

In testimony whereof I aflix my signature.

WARREN E. ELLIS.

